The Wealth of Nations by Part 4 Chapter 5 Page 107

It is not indeed the direct purpose of his trade to sell his corn there. But he will generally be willing to do so, and even for a good deal less money than he might expect in a foreign market; because he saves in this manner the expense of loading and unloading, of freight and insurance. The inhabitants of the country which, by means of the carrying trade, becomes the magazine and storehouse for the supply of other countries can very seldom be in want themselves. Though the carrying trade might thus contribute to reduce the average money price of corn in the home market, it would not thereby lower its real value. It would only raise somewhat the real value of silver.

The carrying trade was in effect prohibited in Great Britain, upon all ordinary occasions, by the high duties upon the importation of foreign corn, of the